drm/rockchip: dw_hdmi: Filter modes based on hdmiphy_clk

RK3228 and RK3328 clock rate is being validated against a mpll config
table intended for a Synopsys phy, and not the used inno-hdmi-phy.

Instead get a reference to the hdmiphy clk and validate rates against
it to enable use of HDMI2.0 modes, e.g. 4K@60Hz, on RK3228 and RK3328.

For Synopsis phy the max_tmds_clock validation is sufficient.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Tested-by: Diederik de Haas <didi.debian@cknow.org> # Rock64
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20240908145511.3331451-2-jonas@kwiboo.se